A flat bed scanner system for optically sensing a transparent original image and producing three channels of binary digital data representing the densities of the original image. Each channel produces data in response to one sensing color and sensing of the original image occurs by directing a focused image of a beam of white light onto and across the original image in a pattern of parallel scan lines there being a plurality of sensing positions along each scan line, and producing the digital output data in response to the modulated beam of light transmitted by the original image. There is an optical system which provides for the directing of the beam of white light across the original image and which directs the modulated beam onto sensors. The optical system includes color correction and field flattening of the beam of white light and provides a cylinder condenser lens for the modulated beam of white light. An electronic system receives signals from the sensors and converts them into the desired digital data through analog to digital and logarithmic conversion circuits, base line correction circuits and references compensation circuits. The electronic system also provides a sample clock signal synchronizing the locations of the sensing beam with the locations of the sample positions by way of an optical grating system. An electromechanical system is provided to maintain the optical system in focus from scan line to scan line on both the original image and the optical grating system.

Flat bed scanner system and method

A laser beam is widened in one dimension to cover an array of a substantial number of electro-optic gates The beam is divided by the gates into a plurality of potential spot-forming beams The transmission of each beam to a photosensitive surface is selectively inhibited in accordance with a pre-determined pattern or program, while the beams are swept relative to the photosensitive surface to form characters and other images Preferably, the gates are formed by a wafer of PLZT electro-optic ceramic material, with a large number of closely-spaced electrodes on the surface, in cooperation with a crossed polarizer Preferably, the beams are collimated and a traveling lens and reflector combination is moved parallel to the photosensitive surface in the collimated beams to space the spots on the film from one another The collimated beams are made convergent so that a relatively small, light-weight lens can be used to compose relatively long lines of text without excessive loss of light or vignetting Also provided are a relatively simple but stable lens-reflector carriage and rail structure on which the carriage travels in order to sweep the beam relative to the photosensitive surface

Photocomposing machine and method

An image information device of a construction wherein there are provided a laser oscillator; a modulator capable of modulating a laser beam oscillated from the laser oscillator by an external signal; a photosensitive body consisting essentially of an insulating layer, a photoconductive layer, and an electrically conductive substrate; a principal scanning means such as a polygonal revolving mirror, galvano-mirror, etc. to cause the modulated laser beam to scan the photosensitive body in the principal scanning direction; an optical system to cause the laser beam to focus on the photosensitive body; a position detection means to establish a commencing position of the scanning laser beam on the photosensitive body; means to input an image signal into the modulator in synchronism with the principal scanning means by an output from the position detection means; means to electrically charge the photosensitive body; corona discharge means to impress on the photosensitive body an A.C. corona discharge or a D.C. corona discharge having an opposite polarity to the above-mentioned electric charge simultaneously with, or immediately before, or immediately after, the scanning of the photosensitive body with the laser beam; means to effect overall exposure of the photosensitive body; means to develop an electrostatic latent image formed by the abovementioned means; means to transfer the latent image onto an image transfer material; and means to clean the photosensitive body.

Image information electrostatic recording device

A scanning optical system is used to re-form an original image on a CCD line sensor. The optical system has an object side lens unit, a mirror and an image side lens unit. The object side lens unit condenses light from the object. The mirror is arranged between the object side lens to deflect the light having passed through the object side lens unit for scanning. An exit pupil of the object side lens unit coincide with an entrance pupil of the image side lens unit.

Scanning optical system

This specification discloses an f theta lens system having an entrance pupil at a remote position on the incident light side of the lens system and having such a negative distortion that the image height H of a parallel light beam incident at an angle theta with respect to the optical axis with the entrance pupil as the center is H=f theta , where f is the focal length of the entire system. The lens system includes, in succession from the entrance pupil side, a first group having at least one negative lens and having a composite negative refractive power, a second and a third group each having a meniscus lens component having its concave surface facing the entrance pupil side, and a fourth group having at least one positive lens and having a composite positive refractive power.

F( theta ) Lens system of four-group construction

An image projection system successively projects images along a common optical axis toward a photosensitive surface The individual images are spaced side by side on the photosensitive surface The spacing is accomplished by collimating the image bearing light beams, then diverting the collimated beam by means of a movable reflecting surface (or equivalent) into a refocusing and scan lens assembly from which the light beams emit onto the photosensitive surface The position of the reflector is controlled by any suitable means such as a servo mechanism The refocusing and scan lens assembly incorporates compensation for the angular position of the reflecting member with respect to the optical centerline, whereby the images remain in focus and are not distorted even though the photosensitive surface is maintained flat at the image plane of the system

Seymour Rosin

Papers

Image spacing system